THAT SAID, upping the boost on your car will almost certainly not achieve any performance gains, which is why no one does it. Diesels always have an excess of air - unlike a petrol engine they are controlled by how much fuel gets in, rather than how much air.
Be wary of your snorkel though... With all the extra air going through my snorkel has become restrictive now and can hear it sucking alot of air... May do a new intake next i think to get more air through the intake..